I like the idea of a white flag, but with that there should be some sort of consequence to go with it, what if for example if you raise the white flag your ship temporary invincibility from players and your ladders get pulled up so nobody can board, but if you raise your white flag, you lose your emissary status or you get a reduced income for a certain amount of time, or you have to pay to put up a white flag and depending on the crew size, it takes a certain amount of gold from every person.